What Does It Really Cost to Live in London?

Living in a foreign country can be challenging enough — add in the weak dollar to the British pound and it seems impossible to live in London. After three years of living in one of the world's most expensive cities, I no longer bother to do the mental conversion rate to US dollars in my head, as it is just too depressing to think about...

...but for purposes of this list, for those of you thinking in dollars, here is the current exchange rate:
1 British Pound Sterling equals 1.56 US Dollar

A note on neighborhoods: I chose three neighborhoods with varying prices and vibes. Notting Hill was chosen for its quintessential London feel, and of course movie fame. Shoreditch is the edgy East London neighborhood that is quickly on its way to gentrification. For the third neighborhood I chose something south of the river, as prices are generally lower south of the Thames.